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Subject
- Navigation320
- Geology142
- Nautical charts125
- Harbors101
- Groundwater27
- Sediments (Geology)20
- Land use19
- Public lands16
- Roads15
- Aquifers14
- Geology, Stratigraphic12
- Gravity anomalies12
- Administrative and political divisions10
- Coal10
- Coasts10
- Hydrogeology10
- Mines and mineral resources8
- Petroleum shipping terminals8
- Geochemical prospecting5
- Heavy minerals5
